Drag-sawing machine



E. L. & J. A. DUNHAM.

(No Model.)

DRAG SAWING MACHINE.

No. 245,800. Patented Aug. 16,1881.

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UNITED STATES EDWIN L. DUNHAM AND JUSTIN A. DUNHAM, OF QUINCY TOWNSHIP,

PATENT OFFICE.

BRANCH COUNTY MICHIGAN.

DRAG-SAWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 245,800, dated AugustlG, 1881.

7 Application filed January 20, 1881. (No model.)

To all whom it may concern Be it known that we, EDWIN L. DUNHAM andJUSTIN A.DUNHAM, citizens of the United States, residing at Quincytownship, in the county of Branch and State of Michigan, have inventedcertain new and useful Improvements in Drag-Sawing Machines; and we dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings, and to letters or figures of reference markedthereon, which form a part of this specification.

The present invention relates to that class of sawing-machines in whicha reciprocating drag-saw is operated through the medium of a system oflazy-tongs or shear-levers, and devices for imparting motion thereto.

The object of the invention is to furnish a machine which shall be moresimple in construction and effective in operation than others of thesame class heretofore known.

To these ends the invention consists in the construction and combinationof parts, which will be hereinafter more fully described, and then setforth in the claim.

In the drawings, Figure l is a perspective view of a sawing-machineembodying our improvements. Fig. 2 is a detail view of the drag-saw andlazy-tongs, and operating-lever combined therewith.

The parallel base sills, A, and front standards, B, constitute the frameof the machine. The base sills are held at a suitable distance apartfrom each other, so as to receive the series of lazy-tongs orshear-levers 0 between them. These levers are pivoted or jointedtogether in the customary manner, and the front pair of levers areconnected with a sliding block or cross-head, D, which moves inguideways on the sill A. Bails E, secured to said sills, form spacesbetween the same and therails for the reception of the ends of thecross-head D. The rear pair of shear-levers are connected with a post orshort standard, F,which is bolted to the base-sills.

A vertical lever, G, pivoted to the base-sills in rear of the post F, isconnected with the lazy-tongs or shear-levers by means of the links orconnecting-bars H. This lever G is operated by hand, and serves to openand close the lazy-tongs or shear-levers for imparting a reciprocatingmotion to the drag-saw I connected therewith. The saw slides back andforth between the standards B, and is connected with the sliding blockor cross-head D by means of the connecting-rod J, one end of which isriveted to the saw,and the other end is pivot-jointed to the cross-headD.

A lever, K, extending in front of the frame of the machine and fittedbetween the standards B, is connected therewith by a suitable pivot orfulcrum-pin, a. A series of holes made in said standards serve forshitting the position of the fulcrum pin, so as to raise or lower thelever K, according to the size or diameter of the log to be operatedupon.

The front end of the lever K carries a sawguide, L, which may be asimple slotted plate through which the saw passes, or a pair ofspring-plates may receive the saw between the same. In either case thesaw operates freely through the guide, the object thereof being chieflyto provide meansfor guidingor steadying the movement of the saw,whetherthe logs be large or small. A hook or spur, M, at the front end of thelever K, enters the log and holds it steadily during the sawingoperation.

The lever K extends in rear of the standards B, and is locked toastandard, N, which rises from the base sills, A. The upper portion ofthis standard is curved in a forward direction, and has a series ofholes, 0, for receivingalocking-piu,d,which ispassed through the leverand standard. The object of this arrangement is to enable the lever K,and saw guided thereby, to beheld at different elevations, as willreadily be apparent. The lower portionofthe standard Nis bifurcated orforked, so that the shear-levers or lazy-tongs can play back and forthbetween said forked portion.

A sawing-machine constructed according to the present invention is verysimple in construction, and is more easily-operated than other machineswhich employ a complicated system of lazy-tongs and operating devices.

It will be apparent that the construction shown is specially designed toincrease the bars, and the base-sills, all constructed and length of thesaw-stroke. relatively arranged as herein set forth,for the Having thusfully described our invention, purpose specified. what we claim as new,and desire to secure by In testimony whereof we affix our signatures 5Letters Patent, is in presence of two witnesses.

In a drag-sawing machine, the combination EDWIN LORENZO DUNHAM. of thelazy-tongs or shear-levers, the sliding JUSTIN ALONZO DUNHAM.cross-head, the connecting-rod,with the recip- Witnesses: rocating sawattached, the rear fulcrum-post, A. J. MGGOWAN, o the ertioaloperating-lever, the connecting- F. M. FOX.

